Change-Id: Ib50aea743662376c8c7da82bba4002932da4014c
Change-Id: I2aeb506e5bf7e2301e855456688273fe5f3988a2
Also includes a dummy packager_test with TestingMuxer. Change-Id: I6a6e6dd77e343ef742adc1846ede203993628943